A delicate and retro vertical stripe harkening back to the first quarter of the 20th century, specifically 100 years ago, which was a time when art nouveau was over, art deco had not yet been created, and though one of the prevailing artistic trends was called craftsman, this isn't quite it.
It does have the look of what I have seen in publications of that era, though I don't quite know what that style is named (if it has a name at all).
(file k74e2)